Trees

, Volume 18, Issue 5, pp 553–558

Expression of crassulacean acid metabolism in Clusia hilariana Schlechtendal in different stages of development in the field

Authors

  • Annika Berg
    • Institut für BotanikTechnische Universität Darmstadt
  • Birgit Orthen
    • Departamento de BotânicaUniversidade de Brasília
  • Eduardo Arcoverde de Mattos
    • Departamento de EcologiaUniversidade Federal do Rio de Janeiro
  • Heitor Monteiro Duarte
    • Institut für BotanikTechnische Universität Darmstadt
    • Institut für BotanikTechnische Universität Darmstadt
Original Article

DOI: 10.1007/s00468-004-0347-6

Cite this article as:
Berg, A., Orthen, B., de Mattos, E.A. et al. Trees (2004) 18: 553. doi:10.1007/s00468-004-0347-6

Abstract

Expression of crassulacean acid metabolism (CAM) in the obligate CAM-tree Clusia hilariana SCHLTDL. was studied in the restinga of Jurubatiba National Park, on the Atlantic coast of Rio de Janeiro state, Brazil, comparing plants at different developmental stages. Between young and mature plants there were trends of differences in six parameters, which are all related to CAM expression. From young to mature plants there were tendencies for a decrease of (1) the degree of succulence, (2) the degree of day/night changes of malic acid levels, (3) titratable acidity with nocturnal acid accumulation, (4) the degree of day/night changes of free hexoses with nocturnal break down, (5) effective quantum use efficiency of photosystem II at high photosynthetic photon flux density, and (6) protection from photoinhibition. These tendencies form a clear pattern which suggests that CAM was somewhat more pronounced in leaves of young plants than in leaves of mature plants. A developmental regulation may be involved. However, the observations are probably best explained by stress, since in the dry soils of the restinga young plants have no access to the ground water table while adult trees develop extensive root systems.

Keywords

Clusia Crassulacean acid metabolism (CAM) Development Photoinhibition Restinga

Copyright information

© Springer-Verlag 2004